PowerShell DownloadFile

 1title: PowerShell DownloadFile
 2id: 8f70ac5f-1f6f-4f8e-b454-db19561216c5
 3status: test
 4description: Detects the execution of powershell, a WebClient object creation and the invocation of DownloadFile in a single command line
 5references:
 6    - https://www.fireeye.com/blog/threat-research/2020/03/apt41-initiates-global-intrusion-campaign-using-multiple-exploits.html
 7author: Florian Roth (Nextron Systems)
 8date: 2020-08-28
 9modified: 2021-11-27
10tags:
11    - attack.execution
12    - attack.t1059.001
13    - attack.command-and-control
14    - attack.t1104
15    - attack.t1105
16logsource:
17    category: process_creation
18    product: windows
19detection:
20    selection:
21        CommandLine|contains|all:
22            - 'powershell'
23            - '.DownloadFile'
24            - 'System.Net.WebClient'
25    condition: selection
26falsepositives:
27    - Unknown
28level: high